Sliding-leg ellipsograph



Aug. 24, 1926. 1,597,579

w. H. CONIBYEAR SLIDING LEG ELLIPSCGRAPH Filed Jul 21, 1925 74 5/1502)? (bizz'liag' INVENTOR W.

BY M o v Al IORNEY Patented Aug. 24, 1926.

UNITED STATES WILLIAM H. CONIBEAR, OF SILVERTON, OREGON.

SLIDING-LEG ELLIPSOQRAPH.

Application filed July 21, 1925. Serial No. 45,066.

The object of this invention is to provide means for striking an ellipse, the device to include a segmental element provided with graduations, and a slidable element movable on said segmental element, this slidable element being formed with a main leg, and serving to slidably mount a sleeve on which is pivoted a second leg movable with refer ence to the leg first named and adapted to be secured in an adjusted position.

' To the attainment of the foregoing, the invention consists in the improvement as hereinafter described and definitely claimed.

In the drawing forming-part of this'application The figure shows the device in perspective and in operative position.

A segmental element 10 is graduated and forms a part of a true circle, the graduations employed running from 20 degrees to 90 degrees. The lower end is deflected as shown to form a leg portion 11, and other leg portions 12 and 13 have the relation to element 11 illustrated in the drawing.

A clamp or the like designated 15 includes a recessed portion open at one side, and the clamp is slidable along the segmental bar 10 and is adapted to be secured in an adjusted position by means of a screw 16. c

Formed with clamp 15 is a-main leg 17 ha ing a lower end 18 to be placed on the center about which the ellipse is to be drawn. A sleeve 20 is slidable on leg 17 and includes ears 21 in which a short leg 22 is mounted by means of a pivot 23. Leg 22 has a slot 24 therein, and arm 25 formed on sleeve 20 passes thru slot 24, the arm bea ing curved asshown, and the pivoted leg 22 is secured in an adjusted position on arm by means of screw 26.

The operation of the device in striking the ellipse will be understood by those skilled in the art.

Having thus described my invention, 1'

claim 1. A. device ofthe class described, comprisfrom'said segmental arm to form the radius of a circle of which the segmental bar forms an are, a sleeve slidable on the main leg, a second leg pivotally mounted on the sleeve, an arm connected with the sleeve, and curved on the arc of a circle struck from the Pivotal point, of the second l g, g i

means formed on the second leg for cooperation wlth the arm on the sleeve. and means for retaining the second leg 1n an adjusted position with reference to the arm" last named.

In testimony whereof I aifix my signature.

WILLIAM 1-1.. GONIBEAR. 

